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Format of Phoenix Enhanced Disk Drive Spec Fixed Disk Parameter Table

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Offset Size Description

00h

WORD

physical I/O port base address

02h

WORD

disk-drive control port address

04h

BYTE

drive flags (see #00279)

05h

BYTE

proprietary information
bits 7 - 4 : reserved (0)
bits 3 - 0 : Phoenix proprietary (used by BIOS)

06h

BYTE

IRQ for drive
bits 7 - 4 : reserved and must be 0
bits 3 - 0 : reserved and must be 0

07h

BYTE

sector count for multi-sector transfers

08h

BYTE

DMA control
bits 7 - 4 : DMA type (0-2) as per ATA-2 specification
bits 3 - 0 : DMA channel

09h

BYTE

programmed I/O control
bits 7 - 4 : reserved (0)
bits 3 - 0 : PIO type (1-4) as per ATA-2 specification

0Ah

WORD

drive options (see #00280)

0Ch

2 BYTEs

reserved (0)

0Eh

BYTE

extension revision level
high nybble = major
low nybble = minor
(currently 10h for v1.0 and 11h for v1.1-3.0)

0Fh

BYTE

2's complement checksum of bytes 00h-0Eh
8-bit sum of all bytes 00h-0Fh should equal 00h

Note:

This structure is also called the Device Paramter Table Extension (DPTE).

See Also:

#00277